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	<div id="pagetitle"><h1>YUI Library Examples: Slider Control: Basic Vertical Slider</h1></div>
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	<h1>Slider Control: Basic Vertical Slider</h1>
	
	<div class="exampleIntro">
	<p>This example demonstrates a simple vertical implementation of the <a href="http://developer.yahoo.com/yui/slider/">YUI Slider Control</a>.  Some characteristics of this implementation include the following:</p>
<ul>
<li>The slider range is 200 pixels.</li>
<li>Custom logic is applied to convert the current pixel value
(from 0 to 200) to a "real" value.  In this case the "real"
range is 0 to 300.</li>
<li>The value is set to 30 after the control is initialized</li>
<li>Once the slider has focus, the up and down keys will move
the thumb 20 pixels (changing the "real" value by 30).</li>
<li>When the slider value changes, the UI is updated.  The title
attribute of the slider background is updated with the current
value, and the text field is updated with the current "real"
value.  These techniques can help inform assistive technologies
(like screen reader software) about the slider's current state.</li>
</ul>
			
	</div>	
					
	<div class="example-container module ">
			<div class="hd exampleHd">
			<p class="newWindowButton yui-skin-sam"><!--<span id="newWindowLinkx"><span class="first-child">--><a href="slider-simple_clean.html" target="_blank">View example in new window.</a><!--</span></span>-->		
		</div>		<div id="example-canvas" class="bd">
	
		
	<!--BEGIN SOURCE CODE FOR EXAMPLE =============================== -->
	
	<!-- 
    You supply your own markup for the slider:
    - The thumb element should be a child of the slider background
    - The tabindex attribute lets this element receive focus in most browsers.
    - If the slider background can receive focus, the arrow keys can be used to change
      this slider's value.
    - We use an img element rather than a css background for the thumb to get around
      a performance bottleneck when animating the thumb in IE
    - Both elements should have a position style: relative or absolute
    - Don't apply a css border to the slider background
-->

<div id="slider-bg" class="yui-v-slider" tabindex="-1" title="Slider">
    <div id="slider-thumb" class="yui-slider-thumb"><img src="assets/thumb-bar.gif"></div>
</div>

<p>Pixel value: <span id="slider-value">0</span></p>

<p>Converted value:
<input autocomplete="off" id="slider-converted-value" type="text" value="0" size="4" maxlength="4" />
</p>

<!--We'll use these to trigger interactions with the Slider API -->
<button id="putval">Change slider value to 100 (converted value 150)</button>
<button id="getval">Write current value to the Logger</button> 

<script type="text/javascript">
(function() {
    var Event = YAHOO.util.Event,
        Dom   = YAHOO.util.Dom,
        lang  = YAHOO.lang,
        slider, 
        bg="slider-bg", thumb="slider-thumb", 
        valuearea="slider-value", textfield="slider-converted-value"

    // The slider can move 0 pixels up
    var topConstraint = 0;

    // The slider can move 200 pixels down
    var bottomConstraint = 200;

    // Custom scale factor for converting the pixel offset into a real value
    var scaleFactor = 1.5;

    // The amount the slider moves when the value is changed with the arrow
    // keys
    var keyIncrement = 20;

    Event.onDOMReady(function() {

        slider = YAHOO.widget.Slider.getVertSlider(bg, 
                         thumb, topConstraint, bottomConstraint);

        slider.getRealValue = function() {
            return Math.round(this.getValue() * scaleFactor);
        }

        slider.subscribe("change", function(offsetFromStart) {

            var valnode = Dom.get(valuearea);
            var fld = Dom.get(textfield);

            // Display the pixel value of the control
            valnode.innerHTML = offsetFromStart;

            // use the scale factor to convert the pixel offset into a real
            // value
            var actualValue = slider.getRealValue();

            // update the text box with the actual value
            fld.value = actualValue;

            // Update the title attribute on the background.  This helps assistive
            // technology to communicate the state change
            Dom.get(bg).title = "slider value = " + actualValue;

        });

        slider.subscribe("slideStart", function() {
                YAHOO.log("slideStart fired", "warn");
            });

        slider.subscribe("slideEnd", function() {
                YAHOO.log("slideEnd fired", "warn");
            });

        // set an initial value
        slider.setValue(20);

        // Listen for keystrokes on the form field that displays the
        // control's value.  While not provided by default, having a
        // form field with the slider is a good way to help keep your
        // application accessible.
        Event.on(textfield, "keydown", function(e) {

            // set the value when the 'return' key is detected
            if (Event.getCharCode(e) === 13) {
                var v = parseFloat(this.value, 10);
                v = (lang.isNumber(v)) ? v : 0;

                // convert the real value into a pixel offset
                slider.setValue(Math.round(v/scaleFactor));
            }
        });
        
        // Use setValue to reset the value to white:
        Event.on("putval", "click", function(e) {
            slider.setValue(100, false); //false here means to animate if possible
        });
        
        // Use the "get" method to get the current offset from the slider's start
        // position in pixels.  By applying the scale factor, we can translate this
        // into a "real value
        Event.on("getval", "click", function(e) {
            YAHOO.log("Current value: "   + slider.getValue() + "\n" + 
                      "Converted value: " + slider.getRealValue(), "info", "example"); 
        });
    });
})();
</script>
	
	<!--END SOURCE CODE FOR EXAMPLE =============================== -->
	
		
		</div>
		
	
	</div>			
	</div>
		
	<h2 class="first">Building a Vertical Slider</h2>

<p>You supply your own markup for the slider. Keep in mind the following points about markup for <a href="http://developer.yahoo.com/yui/slider/">YUI Slider Control</a> implementations:</p>
<ul>
<li>The thumb element should be a child of the slider background</li>
<li>The tabindex attribute lets this element receive focus in most browsers.</li>
<li>We use the Sam skin for a 200px vertical slider and use the <code>thumb-bar.gif</code> thumb image from the build assets</li>
<li>If the slider background can receive focus, the arrow keys can be used to change
  this slider's value.</li>
  a performance bottleneck when animating the thumb's position in IE.</li>
<li>Don't apply a CSS border to the slider background</li>
</ul>

<p>Markup:</p>
<textarea name="code" class="HTML" cols="60" rows="1">
<div id="slider-bg" class="yui-v-slider" tabindex="-1" title="Slider">
    <div id="slider-thumb" class="yui-slider-thumb"><img src="http://yui.yahooapis.com/2.8.1/build/slider/assets/thumb-bar.gif"></div>
</div>
<p>Pixel value: <span id="slider-value">0</span></p>

<p>Converted value:
<input autocomplete="off" id="slider-converted-value" type="text" value="0" size="4" maxlength="4" />
</p>

<!--We'll use these to trigger interactions with the Slider API -->
<button id="putval">Change slider value to 100 (converted value 150)</button>
<button id="getval">Write current value to the Logger</button> 


</textarea>

<p>Code:</p>
<textarea name="code" class="JScript" cols="60" rows="1">
<script type="text/javascript">
(function() {
    var Event = YAHOO.util.Event,
        Dom   = YAHOO.util.Dom,
        lang  = YAHOO.lang,
        slider, 
        bg="slider-bg", thumb="slider-thumb", 
        valuearea="slider-value", textfield="slider-converted-value"

    // The slider can move 0 pixels up
    var topConstraint = 0;

    // The slider can move 200 pixels down
    var bottomConstraint = 200;

    // Custom scale factor for converting the pixel offset into a real value
    var scaleFactor = 1.5;

    // The amount the slider moves when the value is changed with the arrow
    // keys
    var keyIncrement = 20;

    Event.onDOMReady(function() {

        slider = YAHOO.widget.Slider.getVertSlider(bg, 
                         thumb, topConstraint, bottomConstraint);

        slider.getRealValue = function() {
            return Math.round(this.getValue() * scaleFactor);
        }

        slider.subscribe("change", function(offsetFromStart) {

            var valnode = Dom.get(valuearea);
            var fld = Dom.get(textfield);

            // Display the pixel value of the control
            valnode.innerHTML = offsetFromStart;

            // use the scale factor to convert the pixel offset into a real
            // value
            var actualValue = slider.getRealValue();

            // update the text box with the actual value
            fld.value = actualValue;

            // Update the title attribute on the background.  This helps assistive
            // technology to communicate the state change
            Dom.get(bg).title = "slider value = " + actualValue;

        });

        slider.subscribe("slideStart", function() {
                YAHOO.log("slideStart fired", "warn");
            });

        slider.subscribe("slideEnd", function() {
                YAHOO.log("slideEnd fired", "warn");
            });

        // set an initial value
        slider.setValue(20);

        // Listen for keystrokes on the form field that displays the
        // control's value.  While not provided by default, having a
        // form field with the slider is a good way to help keep your
        // application accessible.
        Event.on(textfield, "keydown", function(e) {

            // set the value when the 'return' key is detected
            if (Event.getCharCode(e) === 13) {
                var v = parseFloat(this.value, 10);
                v = (lang.isNumber(v)) ? v : 0;

                // convert the real value into a pixel offset
                slider.setValue(Math.round(v/scaleFactor));
            }
        });
        
        // Use setValue to reset the value to white:
        Event.on("putval", "click", function(e) {
            slider.setValue(100, false); //false here means to animate if possible
        });
        
        // Use the "get" method to get the current offset from the slider's start
        // position in pixels.  By applying the scale factor, we can translate this
        // into a "real value
        Event.on("getval", "click", function(e) {
            YAHOO.log("Current value: "   + slider.getValue() + "\n" + 
                      "Converted value: " + slider.getRealValue(), "info", "example"); 
        });
    });
})();
</script>
</textarea>


<h2>Configuration for This Example</h2>

<p>You can load the necessary JavaScript and CSS for this example from Yahoo's servers.  <a href="http://developer.yahoo.com/yui/articles/hosting/?animation&slider&MIN#configure">Click here to load the YUI Dependency Configurator with all of this example's dependencies preconfigured</a>.</p>

				</div>
				<div class="yui-u">
						<div id="loggerModule" class="yui-skin-sam">
						<h3 class="firstContent">YUI Logger Output:</h3>
								<div id="loggerGloss"><p><strong>Note:</strong> Logging and debugging is currently turned off for this example.</p> 
							<p class="loggerButton"><span id="loggerLink"><span class="first-child"><a href="slider-simple_log.html">Reload with logging<br />
	 and debugging enabled.</a></span></span></p></div>
	
						</div>
					
				
					<div id="examples">
						<h3>Slider Control Examples:</h3>
	
						<div id="exampleToc">
							<ul>
								<li class='selected'><a href='../slider/slider-simple.html'>Basic Vertical Slider</a></li><li><a href='../slider/slider-ticks.html'>Horizontal Slider with Tick Marks</a></li><li><a href='../slider/slider-rgb.html'>RBG Slider Control</a></li><li><a href='../slider/slider_vert_swapped.html'>Bottom to top Vertical Slider</a></li><li><a href='../slider/slider_dual_thumb.html'>Horizontal Slider with two thumbs</a></li><li><a href='../slider/slider_dual_with_highlight.html'>Dual-thumb Slider with range highlight</a></li><li><a href='../progressbar/pb_basic.html'>Basic Features (included with examples for ProgressBar Control)</a></li><li><a href='../progressbar/pb_events.html'>Events (included with examples for ProgressBar Control)</a></li><li><a href='../button/btn_example14.html'>Slider Button (included with examples for Button Control)</a></li><li><a href='../layout/adv_layout.html'>Complex Application (included with examples for Layout Manager)</a></li>							</ul>
						</div>
					</div>
					
					<div id="module">
						<h3>More Slider Control Resources:</h3>
						<ul>
							<li><a href="http://developer.yahoo.com/yui/slider/">User's Guide</a> (external)</li>
						<li><a href="../../docs/module_slider.html">API Documentation</a></li>
                            
                            
							<li><a href="http://yuiblog.com/assets/pdf/cheatsheets/slider.pdf">Cheat Sheet PDF</a> (external)</li></ul>
					</div>
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